Removed deprecated and useless 'register' keyword
Removed deprecated and useless 'register' keyword

Fixed clang dashboard warning.

Change-Id: I89056ee91d0aade22bd129367fe3b8fbaf9ab8b5

mspark93/VTK,candy7393/VTK,sumedhasingla/VTK,sankhesh/VTK,SimVascular/VTK,mspark93/VTK,gram526/VTK,SimVascular/VTK,johnkit/vtk-dev,sumedhasingla/VTK,candy7393/VTK,msmolens/VTK,SimVascular/VTK,hendradarwin/VTK,ashray/VTK-EVM,berendkleinhaneveld/VTK,mspark93/VTK,ashray/VTK-EVM,sankhesh/VTK,mspark93/VTK,ashray/VTK-EVM,johnkit/vtk-dev,keithroe/vtkoptix,sankhesh/VTK,jmerkow/VTK,demarle/VTK,gram526/VTK,msmolens/VTK,hendradarwin/VTK,demarle/VTK,johnkit/vtk-dev,SimVascular/VTK,collects/VTK,demarle/VTK,msmolens/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,jmerkow/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,demarle/VTK,sankhesh/VTK,biddisco/VTK,keithroe/vtkoptix,sumedhasingla/VTK,hendradarwin/VTK,hendradarwin/VTK,collects/VTK,sumedhasingla/VTK,mspark93/VTK,SimVascular/VTK,jmerkow/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,candy7393/VTK,sankhesh/VTK,hendradarwin/VTK,keithroe/vtkoptix,sumedhasingla/VTK,ashray/VTK-EVM,gram526/VTK,SimVascular/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,mspark93/VTK,candy7393/VTK,biddisco/VTK,hendradarwin/VTK,candy7393/VTK,biddisco/VTK,biddisco/VTK,gram526/VTK,johnkit/vtk-dev,msmolens/VTK,demarle/VTK,johnkit/vtk-dev,jmerkow/VTK,keithroe/vtkoptix,gram526/VTK,ashray/VTK-EVM,gram526/VTK,collects/VTK,jmerkow/VTK,gram526/VTK,ashray/VTK-EVM,jmerkow/VTK,candy7393/VTK,demarle/VTK,collects/VTK,candy7393/VTK,biddisco/VTK,sankhesh/VTK,msmolens/VTK,mspark93/VTK,keithroe/vtkoptix,biddisco/VTK,berendkleinhaneveld/VTK,collects/VTK,demarle/VTK,msmolens/VTK,demarle/VTK,jmerkow/VTK,gram526/VTK,sumedhasingla/VTK,mspark93/VTK,SimVascular/VTK,sumedhasingla/VTK,candy7393/VTK,johnkit/vtk-dev,hendradarwin/VTK,jmerkow/VTK,johnkit/vtk-dev,keithroe/vtkoptix,ashray/VTK-EVM,collects/VTK,keithroe/vtkoptix,biddisco/VTK,msmolens/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,msmolens/VTK,sumedhasingla/VTK